code: def test_to_string_epsg():
      val = {"init": "epsg:4326", "no_defs": True}
      assert crs.CRS.from_user_input(val).to_string() == "EPSG:4326"
  
file_path: Fiona/tests/test_crs.py
imports: import pytest
  from .conftest import requires_gdal33
  from fiona import crs
  from fiona.env import Env
  from fiona.errors import CRSError, FionaDeprecationWarning
label_desc: Use image node_id 4 for calling a global function with example usage: test_to_string_epsg() without return types